Which gas makes up about 78% of Earth's atmosphere?

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Multiple Choice

Which gas makes up about 78% of Earth's atmosphere?

Explanation:
The main idea being tested is which gas is most abundant in Earth's atmosphere. Nitrogen makes up about 78% of the air by volume, so it is the dominant component. Because it is so plentiful, it sets the overall composition of the atmosphere more than any other gas. Oxygen is the next most abundant, at around 21%, but it pales in comparison to nitrogen. The remaining gases, like argon and carbon dioxide, exist only in trace amounts. Remember, the 78% figure is approximate and can vary slightly with altitude and location, but nitrogen stays the primary constituent of the air.

The main idea being tested is which gas is most abundant in Earth's atmosphere. Nitrogen makes up about 78% of the air by volume, so it is the dominant component. Because it is so plentiful, it sets the overall composition of the atmosphere more than any other gas. Oxygen is the next most abundant, at around 21%, but it pales in comparison to nitrogen. The remaining gases, like argon and carbon dioxide, exist only in trace amounts. Remember, the 78% figure is approximate and can vary slightly with altitude and location, but nitrogen stays the primary constituent of the air.

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